Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1eb5997a893c4ec…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 23:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43a20e83b2d32f632abfa00a3a3e034f SHA-1: 941550a5913fb2e0171240ea9e6c8e01a28e8d36 SHA-256: e1eb5997a893c4ec04c8a5080f1bc28c5171b59937b05698c82d9a7e1b9476dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=design+home+mod+apk+android+1 PDF link annotation
    • http://www.photonics-science.com/ckfinder/userfiles/files/51070077205.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/90748919940.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/21332989610.pdfIn PDF document text
    • https://simorgh.it/uploads/file/97215691220.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/tukofefiluzuz.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/kemojufowebupuze.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210909191942.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613442db22890---52941984728.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/614129097.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/65965291547.pdfIn PDF document text
    • https://subarini.ro/mm/file/15888100375.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/58117908527.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/zezam.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/dijirutarapoxapet.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/22364309290.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/22811673609.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/pativorolizanubu.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/bibazukexawibidebewus.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/mosigekanoful.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/54421269055.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/wegugototelowegobivob.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/gotetonugezukanewototig.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/xiduxofuvibu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 17948 bytes
SHA-256: bc9864a6bb20d795895eac64a5dfc89c95867635868c844455c3dc3c32a2a928
font_01_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 10840 bytes
SHA-256: 473734c12f47aeaf7fa01f69eb999a9c51ae986b9bc288e36bc33617357f2c53
font_02_sfnt_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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